Order Allow,Deny
Allow from all
Deny from 110.0.0.0/8
Deny from 111.0.0.0/8
Deny from 112.0.0.0/5
Deny from 120.0.0.0/6
Deny from 124.0.0.0/8
Deny from 125.0.0.0/8
Deny from 147.0.0.0/8
Deny from 169.208.0.0
Deny from 175.0.0.0/8
Deny from 180.0.0.0/8
Deny from 182.0.0.0/8
Deny from 183.0.0.0/8
Deny from 202.0.0.0/8
Deny from 203.0.0.0/8
Deny from 210.0.0.0/8
Deny from 211.0.0.0/8
Deny from 218.0.0.0/8
Deny from 219.0.0.0/8
Deny from 220.0.0.0/8
Deny from 221.0.0.0/8
Deny from 222.0.0.0/8

.htaccess works almost real-time (there may be some caching etc but in fact it does take seconds or minutes). Your problem is that your website isn't yet re-indexed and no one can tell you exect time when it will be.

jakal just use this .htaccess file before you start creating PBN..
You use it few weeks/months after your site was indexed so it's a little too late Now you must wait another few months for deindexation

It is not the .htaccess. If the link crawlers have already indexed the links then they will wait for a few crawls before dropping the links from their index. Mostly they will drop it within a month or so, that is what i have seen.

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